滇池微生物解磷与聚磷作用的实验研究及磷的现代沉积与微生物成矿作用

滇池是世界上磷质来源最丰富的湖泊，是研究磷的现代沉积和微生物对磷循环作用及微生物成矿的天然场所。研究发现，滇池微生物种群和数量繁多，但能对磷溶解、转化、迁移、聚集、沉积的微生物主要有解磷菌和聚磷菌两类。这两类微生物与滇池磷的含量之间有一系列规律的相关性：在底泥磷高含量区域，解磷菌的种群和数量与底泥磷含量成负相关关系，与水体磷含量成正相关关系，而聚磷菌的种群和数量与底泥磷含量成正相关关系，与水体磷含量成负相关关系；在底泥磷低含量区域，上述相关性则相反。滇池中这种活着的微生物在自然环境条件下对磷的溶解、转化、迁移、聚集和沉积的作用，对古磷块岩微生物成矿说提供了可靠的依据，而且对以磷为限制性因子的湖、海、江河环境污染的防治提供了理论资料。     

苏北榴辉岩中水晶的形成时代及其对超高压变质岩折返的示踪意义

江苏东海水晶以其晶体粒大和产量巨大而闻名，在地质上也因其产于高压超高压变质带而独具特色。在对大别—苏鲁超高压变质带的区域成矿作用进行研究和对中国大陆科学钻探工程(CCSD)主孔岩心进行编录的过程中，认识到超高压带存在着超低压成矿现象，包括中国最主要的水晶矿床成矿带在内的许多矿床都可能是在超高压变质之后退变质结束阶段的超低压环境中形成的，对水晶进行流体包裹体的Rb-Sr等时线年代学研究，获得208Ma的等时线年龄，表明成矿时代为印支期。该年代可视为超高压变质带折返并经历了退变质之后而“稳定”下来的时间。     

略阳煎茶岭铜镍硫化物矿床Re—Os同位素年龄及其地质意义

采用矿石Re-Os同位素方法对陕西省煎茶岭硫化镍矿床矿石进行了成矿年代学研究,获得了878士27 Ma(1σ)的等时线年龄,首次厘定了该矿床成矿时代为新元古代,成岩成矿基本同时.通过对878 Ma硫化镍矿石初始Re-Os同位素体系的γOs计算和Re/Os值分析表明,其yOs和Re/Os值变化范围大,深部条带状矿石的Re/Os值仅为0.05,yOs为-6.70;块状矿石的Re/Os值范围为4.24～24.43,γOs为-15.37～+280.65,说明成矿过程中有壳源物质的混染;两件样品的γOs为负值(-15.37,-6.70),可能指示其超镁铁质岩浆来源于Re亏损地幔.煎茶岭超基性岩体年龄及其镍矿石的Re-Os等时线年龄与扬子克拉通北缘火山岩浆活动时间相对应,它们是扬子克拉通西北缘晋宁期构造岩浆成矿作用的产物.     

云南个旧锡矿床成因研究综述

从成矿地质背景、矿床地质特征及地质发展史出发，依据矿石光片鉴定及鲕状黄铁矿电子探针分析，综合分析前人提出的岩浆热液成矿和热水沉积成矿的证据，认为个旧锡多金属矿床既存在热水沉积成矿作用，又有岩浆热液成矿作用，为热水沉积-岩浆热液叠生矿床。     

Theory and Method of Mineral Resource Prediction Based on Synthetic Information

Metallogenic prognosis of synthetic information uses the geological body and the miaeral resource body as a statistical unit to interpret synthetically the information of geology, geophysics, geo-chemistry and remote sensing from the evolution of geology and puts all the information into one entire system by drawing up digitalized interpretation maps of the synthetic information. On such basis, differ-ent grades and types of mineral resource prospecting models and predictive models of synthetic informa-tion can be established. Hence, a new integrated prediction system will be formed of metallogenic prog-nosis (qualitative prediction), mineral resources statistic prediction (determining targets) and mlaeral resources prediction (determining resources amount).     

Application of Weights of Evidence to Mineral Potential Mapping of Yujiacun Ore Field in Northwest Yunnan Province, China

The multivariate information conprehensive processing technique is especially important at present to the digital mineral prospecting. However, the GIS-based weights of evidence have provided us with powerful tool for the quantitative assessment of mineral resource potential. In this paper, the mineralization model is established, based on the achievements made by previous researchers, to mend such deficiencies ad few references on ore fields in Yujiacun, Yunnan Province and the shortage of quantitative prediction and assessment of mineral resources. In addition, the weights of evidence are used to make a systematic quantitative prediction and assessment of mineral resources there, so that 2 mineral prospecting target areas of grade Ⅰ and 8 mineral prospecting target areas of grade Ⅱ are delineated, providing the further mineral resource exploration with the basis for the selection of mineral deposits.